#include "ObjectPool.h"
#include "../Comm/Comm.h"
#include "../ThreadCache/ThreadCache.h"
#include "../PageCache/PageCache.h"
//cpp中定义单份实例，其它cpp文件中使用extern声明:最佳实践

//for thread_cache
ObjectPool<ThreadCache> pool_for_thread;

//for spanlist
ObjectPool<Span> pool_for_spanlist;

//for PageMap:leaf
//PageMap中直接定义为内部私有类,因此不在此处创建
